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Protective efficacy of attenuated Salmonella Typhimurium strain expressing BLS, Omp19, PrpA, or SOD of Brucella abortus in goats

  • Leya, Mwense (College of Veterinary Medicine, Jeonbuk National University) ;
  • Kim, Won Kyong (College of Veterinary Medicine, Jeonbuk National University) ;
  • Ochirkhuyag, Enkhsaikhan (College of Veterinary Medicine, Jeonbuk National University) ;
  • Yu, Eun-Chae (Korea Zoonosis Research institute, Jeonbuk National University) ;
  • Kim, Young-Jee (Korea Zoonosis Research institute, Jeonbuk National University) ;
  • Yeo, Yoonhwan (Korea Zoonosis Research institute, Jeonbuk National University) ;
  • Yang, Myeon-Sik (College of Veterinary Medicine, Jeonbuk National University) ;
  • Han, Sang-Seop (Korea Zoonosis Research institute, Jeonbuk National University) ;
  • Lee, John Hwa (College of Veterinary Medicine, Jeonbuk National University) ;
  • Tark, Dongseob (Korea Zoonosis Research institute, Jeonbuk National University) ;
  • Hur, Jin (College of Veterinary Medicine, Jeonbuk National University) ;
  • Kim, Bumseok (College of Veterinary Medicine, Jeonbuk National University)
  • 투고 : 2020.09.18
  • 심사 : 2021.01.04
  • 발행 : 2021.03.31

초록

Background: Attenuated Salmonella strain can be used as a vector to transport immunogens to the host antigen-binding sites. Objectives: The study aimed to determine the protective efficacy of attenuated Salmonella strain expressing highly conserved Brucella immunogens in goats. Methods: Goats were vaccinated with Salmonella vector expressing individually lipoprotein outer-membrane protein 19 (Omp19), Brucella lumazine synthase (BLS), proline racemase subunit A (PrpA), Cu/Zn superoxide dismutase (SOD) at 5 × 109 CFU/mL and challenge of all groups was done at 6 weeks after vaccination. Results: Among these vaccines inoculated at 5 × 109 CFU/mL in 1 mL, Omp19 or SOD showed significantly higher serum immunoglobulin G titers at (2, 4, and 6) weeks post-vaccination, compared to the vector control. Interferon-γ production in response to individual antigens was significantly higher in SOD, Omp19, PrpA, and BLS individual groups, compared to that in the vector control (all p < 0.05). Brucella colonization rate at 8 weeks post-challenge showed that most vaccine-treated groups exhibited significantly increased protection by demonstrating reduced numbers of Brucella in tissues collected from vaccinated groups. Real-time polymerase chain reaction revealed that Brucella antigen expression levels were reduced in the spleen, kidney, and parotid lymph node of vaccinated goats, compared to the non-vaccinated goats. Besides, treatment with vaccine expressing individual antigens ameliorated brucellosis-related histopathological lesions. Conclusions: These results delineated that BLS, Omp19, PrpA, and SOD proteins achieved a definite level of protection, indicating that Salmonella Typhimurium successfully delivered Brucella antigens, and that individual vaccines could differentially elicit an antigen-specific immune response.

키워드

과제정보

This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (Grant No.: HI16C2130) and supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1A6A1A03033084).

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